Fabrication Characteristics and Mechanical Behavior of Fly Ash-Alumina Reinforced Zn-27Al Alloy Matrix Hybrid Composite Using Stir-Casting Technique

This paper reports the viability of developing Zn-27Al alloy matrix hybrid composites reinforced with alumina, graphite and fly ash (solid waste bye product of coal in thermal power plants). This research work was aimed at developing low cost-high performance Zn-27Al matrix composite with low density. Alumina particulates (Al2O3), graphite added with 0, 2, 3, 4 and 5 wt% fly ash were utilized to prepare 10wt% reinforcing phase with Zn-27Al alloy as matrix using two-step stir casting method. Density measurement, estimated percentage porosity, tensile testing, micro hardness measurement and optical microscopy were used to assess the performance of the composites produced. The results show that the hardness, ultimate tensile strength, and percent elongation of the hybrid composites decrease with increase in fly ash content. The maximum decrease in hardness and ultimate tensile strength of 13.72% and 15.25% respectively were observed for composite grade containing 5wt% fly ash. The percentage elongation of composite sample without fly ash is 8.9% which is comparable with that of the sample containing 2wt% fly ash with percentage elongation of 8.8%. The fracture toughness of the fly ash containing composites was however superior to those of composites without fly ash with 5wt% fly ash containing composite exhibiting the highest fracture toughness. The results show that fly ash can be utilized as complementary reinforcement in ZA-27 alloy matrix composite to reduce cost.

Authors:

• Oluwagbenga B. Fatile
• Felix U. Idu
• Olajide T. Sanya

Keywords:

• Fly ash
• hybrid composite
• mechanical behaviour
• stir-cast.

References:

[1] B.O. Fatile, J.I. Akinruli, and A.A. Amori, “Microstructure and
mechanical behaviour of stir-cast Al-Mg-Sl alloy matrix hybrid
composite reinforced with corn cob ash and silicon carbide”, Int. j. of
Eng. and Tech. Innovation, vol. 4, no. 4, pp. 251-259, 2014.
[2] K.K. Alaneme, B. O. Fatile, and J.O. Borode, “Mechanical and
corrosion behaviour of Zn‐27Al based composites reinforced with
groundnut shell ash and silicon carbide”, Tribology in Industry, vol. 36,
no 2, pp. 195-203, 2014.
[3] M. Babic, A. Vencl, S. Mitrovic, and I. Bobic, “Influence of T4 heat
treatment on tribological behavior of Za-27 alloy under lubricated
sliding condition”, Tribology Letters, vol. 36, no.2, 125-134, 2009.
[4] R.J. Barnhurst, and S. Beliste, Corrosion properties of Zamak and ZA
Alloys. Quebec, Canada: Noranda Technology Centre, 1992.
[5] S.C. Sharma, B.M. Girish, R. Kamath, B.M. and Satish, “Graphite
particles reinforced ZA‐27 alloy composite materials for journal bearing
applications”, Wear, vol. 219, no. 2, pp. 162 -168, 1998.
[6] B. Bobic, S. Mitrovic, M. Bobic, and I. Bobic, “Corrosion of Aluminium
and Zinc‐Aluminium alloys based metal matrix composites”, Tribology
in Industry, vol. 31, no. 3&4, pp. 44‐52, 2009.
[7] E.J. Kubel, “Expanding horizons for ZA alloys”, Advanced Materials
and Processes, vol. 7, pp. 51‐57, 1987.
[8] C.H. Prakash, and R.D. Pruthviraj, “Microstructural studies of cast Zinc
- Aluminum-Sic-Graphite hybrid composites”, Research J. of Chemical
Sciences, vol. 1, no. 6, 88-90.
[9] K.K. Alaneme, B. O. Ademilua, and M. O. Bodunrin, “Mechanical and
corrosion behaviour of bamboo leaf ash – Silicon Carbide hybrid
reinforced Aluminium based matrix composites”, Tribology in Industry,
vol. 35, no. 1, pp. 25‐35, 2013.
[10] O.A. Olugbenga, and A.A. Akinwole, “Characteristics of bamboo leaf
ash stabilization on lateritic soil in highway construction”, Int. J. of Eng.
and Tech., vol. 2, no.4, pp. 212‐219, 2010.
[11] K.K. Alaneme, A.O. Aluko, “Production and age hardening behaviour of
borax pre mixed SiC reinforced Al-Mg-Si alloy composites developed
by double stir casting technique”, The West Indian J. of Eng., vol. 34,
no. 1‐2, pp. 80 – 85, 2012.
[12] T. S. Kiran, M.P. Kumar, S. Basavarajappa, and B. M. Vishwanatha,
“Mechanical properties of as- cast za-27/gr/sicp hybrid composite for the
application of journal bearing”, J. of Eng. Sci. and Tech., vol. 8, no. 5,
557 -565, 2013.
[13] K. K. Alaneme”, Mechanical behaviour of cold deformed and solution
heat-treated alumina reinforced AA 6063 composites”, J. of European
Ceramic. Society, vol. 35, no. 2, pp. 31-35, 2013.
[14] K. K. Alaneme, “Influence of thermo-mechanical treatment on the
tensile behaviour and CNT evaluated fracture toughness of borax
premixed SiCp reinforced aluminum (6063) composites”, Int. J. of
Mech. and Materials Eng., vol. 7, pp. 96-100, 2012.
[15] K.K Alaneme, “Fracture toughness (K1C) evaluation for dual phase low
alloy steels using circumferential notched tensile (CNT) specimens,
Materials Research., vol. 14, no. 2, pp. 155‐160, 2011.
[16] G. E. Dieter, Mechanical metallurgy. Singapore: McGraw‐Hill, 1988.
[17] S. K. Nath and U. K. Das, “Effect of microstructure and notches on the
fracture toughness of medium carbon steel”, J. of Naval Architecture
and Marine Eng., vol. 3, pp. 15‐22, 2006.
[18] T. Chen, C. Yuan, M. Fu, Y. Ma, Y. Li, and Y. Hao”, Friction and wear
properties of casting in-situ silicon particle reinforced ZA27
composites”, China Foundry, vol. 6, no. 1, 1-8, 2009.
[19] T. W. Courtney, Mechanical behaviour of materials, 2nd ed. India:
Overseas Press, 2006.
[20] K. K. Alaneme, S.M. Hong, I. Sen, E. Fleury, U. Ramamurty, “Effect of
copper addition on the fracture and fatigue crack growth Behaviour of
solution heat‐treated SUS 304H austenitic steel”, Materials Sci. and
Eng.: A, vol. 527, no. 18‐19, pp. 4600 – 4604, 2010.